Tornado incidence maps.
Contributors: National Severe Storms Laboratory.; United States. Environmental Science Services Administration. Research Laboratories.
Series: ESSA technicalmemorandum -- ERLTM-NSSL 49
Publisher: National Technical Information Service
Place of publication: Springfield, Va
Language: eng
Notes: Photocopy of a report published by the National Severe Storms Laboratory, Norman, Okla., 1970.

At head of title: U. S. Department of Commerce, Environmental Science Services Administration, ResearchLaboratories.